I have not searched in the deep about the installation without administrator rights, but I found it is not possible.
Otherwise, if I switch from the restricted user, that is me, to the admin the installation seems to run successful.
But the restricted user does not have an icon to start qcad and starting out of the folder stops with errors.

Is there a practicable way described anywhere how to install and use qcad 2.2.2 on Win XP Prof. without admin rights?